SZD-54-2
„Perkoz”
TECHNICAL SERVICE MANUAL
SECTION 7.
SAILPLANE WEIGHING
Issue II
April 2014
Revision No. 2
May 2017
Allstar PZL Glider Sp. z o.o.
Doc No. 542.4.02
page 7.3
corrected
7.2. Sailplane without pilots mass and CG position
„Sailplane without pilots” term means sailplane with any equipment in
instrument panels and luggage compartment, compatible with current „Equipment
list”, ready to flight, but without pilots, parachutes, balancing weights and hand
luggage.
Mass value (m
bp
) and CG position (X
bp
) of sailplane without pilots, determined
by weighing, must be registered in weighing table in Section 6.4. of Flight Manual.
Sailplane without pilots centre of gravity must be within the range specified in the
chart (Fig. 7
‒2.) – crosshatched area.
If centre of gravity does not fall within the required range, add or reduce
existing appropriate fixed ballast in the front or back of the fuselage. Ballast in the
front, in durable manner, should be placed in space under the cover, under front
balancing weights described in item 1.4. In sailplane tail (vertical stabilizer) ballast
should be placed in cylindrical container inserted into wall opening (Fig. 7
‒3.). As a
rear fixed ballast may also be used a battery mounted in container in vertical
stabilizer (Fig. 7
‒4.). Changing the fixed ballast requires reweighing to verify final
value of the mass (m
bp
) and CG position (X
bp
). Fixed ballast mass (front or rear) must
be entered in the sailplane weighing record (item 18.2.).
Newly manufactured sailplane is weighed as „empty” (with minimal equipment
according to item 8.1.). In factory weighing records for wing span 57,42 ft and
65,62 ft, there is provided its mass (m
p
) and centre of gravity position (X
p
), which
values do not need to be within the range specified in the chart (Fig. 7
‒2.).
(paragraph removed).
Every change of mass and CG position of sailplane without pilots, resulting for
example from carried out repairs, painting or installing/removing additional
equipment, must be determined on basis of subsequent weighing. Only when
installing/removing additional equipment in certain places, i.e. instrument panels or
luggage compartment, it is allowed to determine new value of sailplane without pilots
mass and CG position with calculation method (see item 7.3.).
2